/Engine/Source/Runtime/Core/Public/Misc/Attribute.h
Move the attribute's 'getter' or the attribute'sValue_ and reset the attribute. The attribute needs to be set.
The attribute's FGetter orValue_
[TVariant](API\Runtime\Core\Misc\TVariant)< ObjectType, [FGetter](API\Runtime\Core\Misc\TAttribute\FGetter) > Steal()